Experiment 24 is a pair of operation pairs

Debug Environment: Eclipse

Code:

Package sz;
Import java.util.*;
Import java.applet.*; Introducing the Applet class
Import java.awt.*;
Import java.awt.event.*; Introduce the System event class package.
The public class V11 extends Applet implements actionlistener{//defines the class and implements the action event listener interface.
Label Label1,label2,label3,label4; declares four label objects.
TextField TF1; Declaring a text box object
TextArea area; Declares a text area object
Button Bt1,bt2; declaring two Button objects
Double lb2=0.0;
int s=0;
int a=0;
int b=0;
int y=0;
int z=0;
s saves the total number of questions, a saves the correct number of questions, and B saves the wrong number of answers.

public void init () {//Initialize.
Label1=new Label (); Create an object that does not display content.
Label2=new Label ();
Label3=new Label ();
Label4=new Label ("="); Create an object that displays the content as "=".
Tf1=new TextField (8);
Area=new TextArea (13,40);//Create a text area of 13 rows and 40 columns.
Bt1=new button ("scoring"); Create a button that displays the title "Scoring".
Bt2=new button ("Redo");
Add (Label1);
Add (Label2);
Add (LABEL3);
Add (LABEL4);
Add (TF1);
Add (area);
Add (BT1);
Add (BT2); Use sequential layouts to add components.
Tf1.addactionlistener (this);
Bt1.addactionlistener (this);
Bt2.addactionlistener (this); Register this as the Click event Listener for FT1, BT1, BT2.
Label1.settext (string.valueof ((int) (Math.random () *10));
Label3.settext (string.valueof ((int) (Math.random () *10)));//randomly generate two or 10 integers and display them on labels 1, 3, respectively.
Lb2= (Math.random ()); Randomly generates a decimal within a 0~1.
if (lb2>=0 && lb2<=0.25)
Label2.settext ("+");
else if (lb2>0.25 && lb2<=0.5)
Label2.settext ("-");
else if (lb2>0.5 && lb2<=0.75)
Label2.settext ("*");
else if (lb2>0.75 && lb2<=1)
Label2.settext ("/"); }
The IF statement is used to control the random display of "+,-, *,/" four operators.

public void actionperformed (ActionEvent e) {//Implements the event interface method.
if (E.getsource () ==TF1) {//Determines whether the event source is TF1 or BT1 or BT2.
s=s+1; One trigger TF1 total number of questions added 1.
if (label2.gettext () = = "+") {
int X=integer.parseint (Label1.gettext ()) +integer.parseint (Label3.gettext ());
The characters are converted into numeric values.
if (X==integer.parseint (Tf1.gettext ()))
a=a+1; If the text box is entered correctly, the number of correct answers is plus one.
Else
b=b+1; If the text box entered an error, add one to the wrong number.
}
else if (label2.gettext () = = "-") {
int X=integer.parseint (Label1.gettext ())-integer.parseint (Label3.gettext ());
if (X==integer.parseint (Tf1.gettext ()))
a=a+1;
Else
b=b+1;
}
else if (label2.gettext () = = "*") {
int X=integer.parseint (Label1.gettext ()) *integer.parseint (Label3.gettext ());
if (X==integer.parseint (Tf1.gettext ()))
a=a+1;
Else
b=b+1;
}

else if (label2.gettext () = = "/") {
Y=integer.parseint (Label1.gettext ());
Z=integer.parseint (Label3.gettext ());
do{
Label3.settext (string.valueof ((int) (Math.random () *10));
Z=integer.parseint (Label3.gettext ()); }
while (z==0); The dividend is not 0 with the loop guarantee.
Double x=double.parsedouble (Label1.gettext ())/integer.parseint (Label3.gettext ());
if (Math.Round (x) = = (Integer.parseint (Tf1.gettext ()))//guaranteed to divide by two number, rounding and re-rounding.
a=a+1;
Else
b=b+1;
}
Label1.settext (string.valueof ((int) (Math.random () *10));
Label3.settext (string.valueof ((int) (Math.random () *10));
Lb2=math.random ();
if (lb2>=0 && lb2<=0.25)
Label2.settext ("+");
else if (lb2>0.25 && lb2<=0.5)
Label2.settext ("-");
else if (lb2>0.5 && lb2<=0.75)
Label2.settext ("*");
else if (lb2>0.75 && lb2<=1)
Label2.settext ("/");
Tf1.settext ("");
}
else if (E.getsource () ==bt1) {//bt1 button click event.
Area.settext (""); Clears the text area. Area.append ("*********************************************" + "\ n");
Area.append ("A total Answer:" +s+ "problem.) "+" \ n ");
Area.append ("Congratulations! Answer correctly: "+a+" problem, Answer wrong: "+b+" problem. "+" \ n "); Area.append ("_____________________________________________" + "\ n");
Area.append ("Your current score is:" + ((a*100)/s);//Add text to the text area.
}
else if (E.getsource () ==bt2) {//BT2 button click event.
Area.settext ("");
Label1.settext (string.valueof ((int) (Math.random () *10));
Label3.settext (string.valueof ((int) (Math.random () *10));
Lb2=math.random ();
if (lb2>=0 && lb2<=0.25)
Label2.settext ("+");
else if (lb2>0.25 && lb2<=0.5)
Label2.settext ("-");
else if (lb2>0.5 && lb2<=0.75)
Label2.settext ("*");
else if (lb2>0.75 && lb2<=1)
Label2.settext ("/");
Tf1.settext ("");
}
}
}

33 Liu Heng Blog: http://www.cnblogs.com/iliuh/

Experiment 24 is a pair of operation pairs